English
Tamil Nadu Board of Secondary EducationSSLC (English Medium) Class 9

The third law of Kepler is also known as the Law of ______.

Advertisements
Advertisements

Question

The third law of Kepler is also known as the Law of ______.

Fill in the Blanks
Advertisements

Solution

The third law of Kepler is also known as the Law of Harmonies 5.8.

shaalaa.com
  Is there an error in this question or solution?
Chapter 9: Universe - Exercise [Page 111]

APPEARS IN

Samacheer Kalvi Science [English] Class 9 TN Board
Chapter 9 Universe
Exercise | Q II. 4. | Page 111

RELATED QUESTIONS

Let us assume that our galaxy consists of 2.5 × 1011 stars each of one solar mass. How long will a star at a distance of 50,000 ly from the galactic centre take to complete one revolution? Take the diameter of the Milky Way to be 105 ly


Observe the given figure showing the orbit of a planet moving around the Sun and write the three laws related to it:


The orbit of a planet moving around the Sun


Observe the given figure and answer these following questions.


The orbit of a planet moving around the Sun

  1. What is the conclusion about the orbit of a planet?
  2. What is the relation between velocity of planet and distance from sun?
  3. Explain the relation between areas ASB, CSD and ESF.

The mass and radius of earth is 'Me' and 'Re' respectively and that of moon is 'Mm' and 'Rm' respectively. The distance between the centre of the earth and that of moon is 'D'. The minimum speed required for a body (mass 'm') to project from a point midway between their centres to escape to infinity is ______.


To verify Kepler's third law graphically four students plotted graphs. Student A plotted a graph of T (period of revolution of planets) versus r (average distance of planets from the sun) and found the plot is straight line with slope 1.85. Student B plotted a graph of T2 v/s r3 and found the plot is straight line with slope 1.39 and negative Y-intercept. Student C plotted graph of log T v/s log r and found the plot is straight line with slope 1.5. Student D plotted graph of log T v/s log r and found the plot is straight line with slope 0.67 and with negative X-intercept. The correct graph is of student


A planet revolves in an elliptical orbit around the sun. The semi-major and minor axes are a and b, then the time period is given by:


The centre of mass of an extended body on the surface of the earth and its centre of gravity ______.

  1. are always at the same point for any size of the body.
  2. are always at the same point only for spherical bodies.
  3. can never be at the same point.
  4. is close to each other for objects, say of sizes less than 100 m.
  5. both can change if the object is taken deep inside the earth.

A satellite is in an elliptic orbit around the earth with aphelion of 6R and perihelion of 2 R where R= 6400 km is the radius of the earth. Find eccentricity of the orbit. Find the velocity of the satellite at apogee and perigee. What should be done if this satellite has to be transferred to a circular orbit of radius 6R ?

[G = 6.67 × 10–11 SI units and M = 6 × 1024 kg]


What is at one focus of the elliptical orbit of a planet?


When is a planet moving fastest in its orbit?


Share
Notifications

Englishहिंदीमराठी


      Forgot password?
Use app×